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Knowledge organisers / Input

IPO Pattern

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Knowledge organiser

Input

301.6c

Input -> Process -> Output.

What you need to know

Most programs follow the Input-Process-Output (IPO) pattern: get data from the user, do a calculation, then display the result. Structuring code this way makes it clear and easy to follow.

Key points

  • Input: gather data from the user
  • Process: perform calculations or logic
  • Output: display results to the user
  • Keep the three stages in order for clarity

Code examples

IPO pattern
python
# INPUT
width = float(input("Width: "))
height = float(input("Height: "))

# PROCESS
area = width * height

# OUTPUT
print("Area = " + str(area))